Michael Adler's

A compact yet remarkably realistic model both in appearance and function. 

This model is able to reproduce all the movements of the prototype.   With cables for simulated hydraulics and realistic powered tracks and slewing functions, the model is easily built and ready for your choice of control with switches, joysticks or radio.

Requires 6 non-Meccano geared motors and a few other non-Meccano but easily obtainable components.